Configuring Multi-Vrf Ce; Understanding Multi-Vrf Ce - Cisco WS-CBS3032-DEL Software Configuration Manual

Configuring Multi-VRF CE

Configuring Multi-VRF CE
Virtual Private Networks (VPNs) provide a secure way for customers to share bandwidth over an
ISP-backbone network. A VPN is a collection of sites sharing a common routing table. A customer site
is connected to the service-provider network by one or more interfaces, and the service provider
associates each interface with a VPN routing table known as a VPN routing/forwarding (VRF) table.
The switch supports multiple VPN routing/forwarding (multi-VRF) instances in customer-edge (CE)
devices (multi-VRF CE) when the switch is running the IP services feature set. A service provider uses
multi-VRF CE allows to support two or more VPNs with overlapping IP addresses.
The switch does not use Multiprotocol Label Switching (MPLS) to support VPNs. For information about
Note
MPLS VRF, see the Cisco IOS Switching Services Configuration Guide, Release 12.2.
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Understanding Multi-VRF CE

Multi-VRF CE is a feature that allows a service provider to support two or more VPNs overlapping IP
addresses among the VPNs. Multi-VRF CE uses input interfaces to distinguish routes for different VPNs
and forms virtual-packet-forwarding tables by associating one or more Layer 3 interfaces with each
VRF. Interfaces in a VRF can be either physical, such as Ethernet ports, or logical, such as VLAN switch
virtual interfaces (SVIs), but an interface cannot belong to more than one VRF at any time.
Multi-VRF CE interfaces must be Layer 3 interfaces.
Note
Multi-VRF CE includes these devices:
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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
39-80
Understanding Multi-VRF CE, page 39-80
Default Multi-VRF CE Configuration, page 39-82
Multi-VRF CE Configuration Guidelines, page 39-82
Configuring VRFs, page 39-83
Configuring VRF-Aware Services, page 39-84
Configuring Multicast VRFs, page 39-88
Configuring a VPN Routing Session, page 39-89
Configuring BGP PE to CE Routing Sessions, page 39-90
Multi-VRF CE Configuration Example, page 39-90
Displaying Multi-VRF CE Status, page 39-94
Customer-edge (CE) devices provide customers access to the service-provider network over a data
link to one or more provider edge routers. The CE device advertises the site local routes to the router
and learns the remote VPN routes from it. A switch can be a CE.
Provider-edge (PE) routers exchange routing information with CE devices by using static routing or
a routing protocol such as BGP, RIPv2, OSPF, or EIGRP. The PE is only required to maintain VPN
routes for those VPNs to which it is directly attached. The PE only needs to maintain all of the
service-provider VPN routes. Each PE router maintains a VRF for each of its directly connected
sites. Multiple interfaces on a PE router can be associated with a single VRF if all of these sites
Chapter 39 Configuring IP Unicast Routing
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